Bill Cosby exits with his lawyer Tom Mesereau (left) following a pretrial hearing for his sexual assault trial at the Montgomery County Courthouse in Norristown, Pa., on March 5. (BRENDAN MCDERMID/REUTERS)

Bill Cosby has won two key rulings in his sex assault retrial now underway in Pennsylvania, including one that sets the stage for jurors to hear from his previously banned star witness.

The witness is Marguerite (Margo) Jackson, a Temple University staffer who claims Cosby's chief accuser Andrea Constand once told her she "could" make a false allegation against a high-profile person to "get money to go to school and open a business."

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In court filings, prosecutors have dismissed Jackson as "unreliable" and called her story "absurd" and a "red herring."

The judge overseeing Cosby's case barred Jackson from testifying at Cosby's first trial last year on hearsay grounds. That trial ended with a hung jury.

In the new decisions made public Tuesday, Judge Steven O'Neill reversed position and said Jackson's testimony will be allowed at the retrial, "subject to further rulings" after Constand takes the witness stand first.

O'Neill also said the defense will be allowed to tell jurors how much Cosby paid Constand in their private 2006 civil settlement.

Cosby's camp had "no comment" on the rulings Tuesday, his spokesman told the Daily News.

The defense sought the new rulings as part of their beefed up strategy to paint Constand as a schemer motivated by money.

Prosecutors have hinted they will counter that accusation with evidence Constand turned down offers of gifts and an educational trust and initially sought only an apology before first going to police and later filing a lawsuit when prosecutors declined to file charges.

Bill Cosby's sexual assault trial

In prior paperwork, prosecutors called the defense plan to call Jackson a "desperate" move and questioned why her recollection only came to light more than a decade after Constand first went to police.

They highlighted inconsistencies between Jackson's signed 2016 statement, which was released to the media last year, and a follow-up affidavit she signed in January.

In the 2016 statement, Jackson only paraphrased her alleged conversation with Constand and said it took place "about a year" before Constand left Temple University, where they were colleagues.

Under that timeline, the conversation would have been before Constand's alleged assault by Cosby, prosecutors pointed out in a February filing. Any reference to when the conversation occurred is absent in Jackson's more recent affidavit.

Prosecutors further attacked Jackson's 2018 affidavit because it "miraculously" includes exact quotes attributed to Constand, which would have been uttered some 15 years ago.

According to her affidavit signed Jan. 22, Jackson claims Constand initially told her she was sexually assaulted by an unidentified high-profile person then recanted and said, "I could say it happened, file charges and get money to go to school and open a business."

Constand, 44, claims Cosby drugged and sexually assaulted her at his suburban Philadelphia mansion in 2004. Cosby, 80, claims the encounter was consensual.

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Judge O'Neill previously ruled that five other Cosby accusers can testify once the jury selection process that started Monday is complete and both sides present their opening arguments.

A former colleague of Andrea Constand (pictured) claims she planned to fabricate a sex assault story. (POOL/REUTERS)

Prosecutors hope the other women will convince jurors the comedian once lauded as "America's Dad" is actually a serial sex predator.

One of the extra accusers is former supermodel Janice Dickinson, who claims Cosby drugged and raped her in Lake Tahoe in 1982.

Dickson's lawyer, Lisa Bloom, told The News on Tuesday that Jackson's testimony could backfire on the defense.

"Anyone can sign a written statement, which is often drafted by someone else. But will those facts hold up against tough questions about her timeline when she's all alone on the witness stand?" Bloom asked.

Three of the other accusers slated to testify – Janice Baker Kinney, Chelan Lasha and Lise Lotte-Lublin – are represented by lawyer Gloria Allred, who also happens to be Bloom's mother.

"I think it's a big risk for the defense to have sought to permit evidence of the civil settlement," Allred told The News Tuesday.

"If in fact it was in the millions, as reported, that is not what I would call a nuisance settlement, to make the case go away. If it's in the millions, that means the defense assessed the risk of allowing the case to go forward as substantial," she said.

"And to denigrate a victim who seeks a civil settlement as a person just doing a money grab is to insult all victims who allege that they were drugged and raped," she said.